<div class="d-flex align-items-center login-content">
  <form [formGroup]="myForm">
    <h3 class="d-flex justify-content-center">用户登录</h3>
    <p *ngIf="myForm.invalid" class="text-danger">表单无效！</p>
    <div class="form-group">
      <label for="userName">用户名</label>
      <input type="text" class="form-control" id="userName" aria-describedby="输入用户名" name="userName"
        formControlName="userName" [ngClass]="{'is-invalid':userName.invalid, 'is-valid':
        userName.valid}">
      <div class="valid-feedback">
        用户名格式正确！
      </div>
      <div class="invalid-feedback">
        <span *ngIf="userName.hasError('required')">用户名长度必须大于7位！</span>
        <span *ngIf="userName.hasError('invalidUser')">用户名必须以“zime”开头！</span>
      </div>
    </div>
    <div class="form-group">
      <label for="password">Password</label>
      <input type="password" class="form-control" id="password" name="password" formControlName="password"
        [ngClass]="{'is-invalid':password.invalid, 'is-valid':password.valid}">
      <div class="valid-feedback">
        密码填写正确！
      </div>
      <div class="invalid-feedback">
        密码长度必须大于6位！
      </div>
    </div>
    <button class="btn btn-primary btn-block" [routerLink]="['/management']">提交</button>

  </form>
</div>